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Acquisitions and Dispositions (Proposed Acquisition Of SCANA) (Narrative) (Detail) - USD ($) $ in Millions | 1 Months Ended
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Oct. 31, 2018 | Jan. 31, 2018
SCANA |  |
Business Acquisition And Dispositions [Line Items] |  |
Common stock agreed to issue |  | 66.90%
Combination debt outstanding |  | $ 7,100
One-time rate credit to electric service customers, period within closing |  | 90 days
Business combination, refund to customers |  | $ 575
Discount on existing customers |  | 7.00%
Period to recognize reduction to SCE&G electric service customers bills |  | 8 years
SCANA | Termination Fee Paid By Dominion to SCANA |  |
Business Acquisition And Dispositions [Line Items] |  |
Contract termination fee |  | $ 280
SCANA | Termination Fee Paid to Dominion |  |
Business Acquisition And Dispositions [Line Items] |  |
Contract termination fee |  | 240
SCANA | Upfront Payment | Electric Service Customers |  |
Business Acquisition And Dispositions [Line Items] |  |
Business combination, liability incurred |  | 1,300
SCANA | Subsequent Event |  |
Business Acquisition And Dispositions [Line Items] |  |
Business combination, refund to customers | $ 1,900 |
Discount on existing customers | 14.00% |
Period to provide refund to customer | 20 years |
V.C. Summer Units |  |
Business Acquisition And Dispositions [Line Items] |  |
Business combination cost related to exclusion from rate recovery |  | 1,700
V.C. Summer Units | Subsequent Event |  |
Business Acquisition And Dispositions [Line Items] |  |
Business combination cost related to exclusion from rate recovery | $ 2,300 |
Columbia Energy |  |
Business Acquisition And Dispositions [Line Items] |  |
Business combination cost related to exclusion from rate recovery |  | $ 180
Columbia Energy | Subsequent Event |  |
Business Acquisition And Dispositions [Line Items] |  |
Business combination cost related to exclusion from rate recovery | $ 180 |

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